moved remainder of richards tests to richards/tests

moved richards tests to richards/tests and cleaned up buckley_leverett/bl22.i tests that was failing because of new Outputs format.  This should close ticket #2679
Merge pull request #2680 from WilkAndy/feature_2679

moved remainder of richards tests to richards/tests
Merge commit '560cb0a34bbdd111f2b89bf720a6fec479e438fc'